The German Open Hamburg, established in 1892, is an annual tennis tournament for male professional
players held in Hamburg, Germany and part of the Association of Tennis Professionals (ATP) Tour.
The tournament is played on clay courts at the tennis center Am Rothenbaum. Beginning in 2009,
this tournament was downgraded from an ATP Masters Series event to an ATP World Tour 500 event.
According to tournament officials, this seriously hinders its ability to attract top-ranking players, who
are more likely to participate in tournaments that earn them more points. Juan Monaco is the defending